The flask command is installed by Flask, not your application; it must be told where to find your application in order to use it. The FLASKAPP environment variable is used to specify how to load the application. Unix Bash (Linux, Mac, etc.): $ export FLASKAPP=hello $ flask run.
In order to test Flask installation, type the following code in the editor as Hello.py
Importing flask module in the project is mandatory. An object of Flask class is our WSGI application.
Flask constructor takes the name of current module (__name__) as argument.
The route() function of the Flask class is a decorator, which tells the application which URL should call the associated function.
In the above example, ‘/’ URL is bound with hello_world() function. Hence, when the home page of web server is opened in browser, the output of this function will be rendered.
Finally the run() method of Flask class runs the application on the local development server.
All parameters are optional
The above given Python script is executed from Python shell.
A message in Python shell informs you that
Mental case mac app. Open the above URL (localhost:5000) in the browser. ‘Hello World’ message will be displayed on it.
Debug mode
A Flask application is started by calling the run() method. However, while the application is under development, it should be restarted manually for each change in the code. https://yjryes.weebly.com/goalng-mac-app-bundle.html. To avoid this inconvenience, enable debug support. The server will then reload itself if the code changes. It will also provide a useful debugger to track the errors if any, in the application.
The Debug mode is enabled by setting the debug property of the application object to True before running or passing the debug parameter to the run() method.
Installation is straightforward, using the normal python package install.I do advise you to additionally install the base skeleton applicationso that you can immediately have a running application (without any models yet) and an easy to grow boilerplate.
Checkout installation video on YouTube
Using pip¶
Initialization¶
When starting your application for the first time,all AppBuilder security tables will be created for you.All your models can easily be created too (optionally).
Note
Mac os best terminal app. Since version 1.3.0 no admin user is automatically created, you must use flask fab cli to do it.There are lot’s of other useful options you can use with flask fab like reset user’s password,list all your users and views, etc.
Installation Requirements¶
pip installs all the requirements for you.
Flask App Builder dependes on
If you plan to use Image processing or upload, you will need to install PIL:
or:
Python 2 and 3 Compatibility¶
The framework removed support for python 2 since version 1.13.X
Run Flask App In Background
For version 2.1.1, the minimum supported Python version is 3.6.
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